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All microwaves make some noise when running. Cooling fans, exhaust fans, turntable motor, transformer, and magnetron all make noise. I assume you mean some unusual noise. I need to know more about what kind of noise it is - a loud roar, a rattling sound, a high-pitch squealing sound, a "clunk-clunk" sound or what? By the way, a "klunk-klunk" sound is frequently caused by small debris stuck to the wheels of the turntable support tray. Try cleaning those wheels and the track they roll in.

see this causes and proceed. God bless you
Magnetron
If the microwave is loud or noisy only when
cooking, the magnetron tube might be defective. The magnetron uses high
voltage, high current DC power to generate the microwave frequency that
cooks the food. Under normal circumstances the magnetron is nearly
silent. However if it is damaged or nearly burned out it can begin
emitting high pitched or growling noises. It's not normally dangerous to
use a microwave oven when it makes these noises, but they are an
indication that the magnetron is almost dead and will need to be
replaced.

Exhaust Fan Motor
If the microwave is loud when running the fan motor might be
Stirrer Motor
If the microwave is loud or noisy the stirrer
motor might be worn out. The stirrer is a metal blade which slowly
turns around, deflecting the microwave energy in a random pattern inside
the microwave oven. As the motor nears the end of its useful life it
begins to make grinding noises. The microwave will not heat food evenly
without this stirrer, the motor should be replaced.

Turntable Motor
If the microwave is loud or noisy the
turntable motor might be worn out. This is a common problem and
relatively easy to replace.

What is happening is that the magnetron is shorted, causing the high voltage transformer to overheat. That is what you are smelling is the insulation getting hot. When the magnetron shorts out, it makes a loud buzzing sound. Replacement magnetrons costs almost as much as a new oven so it rarely makes sense to fix.

This sounds like the magnetron is failing, with a typical smell and a loud noise, there are two additional parts that can be a factor, the high voltage capacitor and diode. To pursue this you will need an appliance repairman or tv technician, the parts and labor will probably run the cost of a new microwave oven.

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This can be caused by grease etc. inside
the oven and on the wave guide which is the paper like thing in the oven. If
you can remove it look for burnt areas which may can be scraped off or you may
need to replace it. An appliance parts store usually has the material you can
cut to fit you own.

HI, the sound you herd was the noise filter and running diode. these important components have failed at this point. you will need to replace these components asap, if possible. this will fix your issue.

The Magnetron Cut-off fuse will need to be replace as well. this will blow if there is a malfunction within the unit.

The noise is coming from the high-voltage transformer being overloaded
by something shorting it out. Either the magnatron or the
high-voltage capacitor and diode. Replace the capacitor and
diode then if still not working, replace the magnatron. Its only
affordable if you do it yourself - buy the part on EBAY - lookup
"universal magnatron"
Hope ya fix it!

This is going to be either the high-voltage transformer, the magnetron, or the high-voltage diode.
Magnetrons are the mosty common failure in these, and there is a campaign underway to replace "underperforming" magnetrons.
To see if yours is one of these, visit: http://www.microwavedisplay.com/ge_mw_mag_kit_bulletin.pdf